I know them quite well, and would be happy to take you down there. I tried sending you a PM with my contact details, but the system says that you have chosen not to receive anything. So, PM me if you want more details.
If you go there, make sure you go upstairs to the showroom. I don't know what they have now-a-days there, but they should have some pretty nice cars there at the showroom.
I visited the shop last month, when I was in Hong Kong for two days. Very nice workshop, nice people and some nice cars. And indeed: some interesting cars upstairs .... And if you care: http://hk.geocities.com/tmey2/SPS.html http://sps-performance.de/
I was there again yesterday, and it was like a Ferrari museum! F40, F50, Enzo, and a newly arrived 288 GTO!!! Oh my goodness!!!